Abstract
The high-temperature superconducting Cu oxides — which are intrinsically Mott insulators — are strongly correlated metals because of valence fluctuations involving Cud 9−d 10 configurations. Temperature-dependent X-ray photoemission spectroscopy of theO 1s and Cu 2p levels in the range 10–300 K provides evidence for O-dimerization, with corresponding increase of the Cud 10O 2p 5 “well-screened” XPS-final state belowT c . This supports the suggestion of dynamical mixed-valence and double-exchange antiferromagnetic interaction as an important mechanism for the origin of highT c superconductivity.
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Dauth, B., Kachel, T., Sen, P. et al. Valence fluctuations and oxygen dimerization in high-temperature superconductors from X-ray photoemission spectroscopy. Z. Physik B - Condensed Matter 68, 407–410 (1987). https://doi.org/10.1007/BF01471068
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DOI: https://doi.org/10.1007/BF01471068